>> In fact the reason Mitsu switched from Garett to Mitsu turbos was due to the really expensive price of the Garrett turbos. It was much cheaper for Mitsu to use their own stuff, apart from the fact that the Mitsu turbo spools up much faster.<<
actually I think you got them mixed up. 2G 4G63s come with T25 (Garett turbo) and 1G come with either 14B or 13G (13G for ATs), so Mitsu switched from mitsu turbos to Garett. plus Mitsu turbos spooling much faster is not always true. T3/T4 happens to spool up faster than 20Gs, yet it almost puts out the same amount of power.